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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 19 |
| 4 | 246 |
| 5 | 6486 |
| 6 | 346550 |
| 7 | 37410572 |
| 8 | 8142026722 |
| 9 | 3567024626500 |
| 10 | 3142034178023610 |
[1,3,19,246,6486,346550,37410572,8142026722, 3567024626500,3142034178023610] |